Multiple duplicating apparatus for sound-producing records.



No. 824,710. PATRNTRD JULY 3,190'6.

R. URSGRANDURAMPS. y MULTIPLR UUPLIGATING APPARATUS POR SOUND PRUUUGING RECORDS.

APPLIATI'ON FILED JULY 22, 1905.

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UNTTED 'STATES PATENT FFTCE. Y

EMILE DESGRANDCHAMPS, OF PARIS, FRANCE.

MULUPLE DUPLlcAuNe APPARATUS Fon souND-PRoDuclNe RECQRDS.

Specification of Letters Patent.

Patented July 3, 1906.

Application tiled July 22,1905.` Serial No. 270,867.

an its object isthe impression of such plate-- records for sound-producing instruments, which records are made of hard brit elasti'c material when in a cold-state and which softens when heated, the impression of these plates being performed by means of a press provided with a movable d evice or a turntable carrying the disk and which allows simultaneously or not the heating of the disks or of the material previously to the compression or to the cooling of the disks or the corresponding plates, disk, and the like during or after the compression.

The annexed drawing given by way of example shows a vertical section of `a special form yof this press.

A table 8, which may be rotated round a vertical shaft, carries,by means of springs 13,

plate-forms 10, which may be lowered by the action of the pressure andrest upon the lower plate-form 1 of the press, which is cooled by circulating water or in any other preferred manner, as well as the plate 2 of the press, which is movable. The plate-form 10, carrying a die or electroblock, has previously-been heated over burners l1 or otherwise. Afterward the rotation of the movable table 8 carries under the pl ate-form of the press the previously-heatcd die, as well as the plate 4 to be impressioned, upon which is arranged a second also previously-heateddie 3 and an auxiliary plate 7, which is compressible and made of felt, asbestos, tin, zinc, and the like if the impression is to be obtained on-both sides at a time or simply the compressible plate if the impression is onlyto be done on the under side of the disk-record. This compressible plate 7 may also be previously heated if the nature of the disk to be impressioned requires that. lt may also be wedged up under the movable plate 2. Then different superposed plates may be kept in place by a centering-pin or by the walls of a kind ol mold. The turn-tab e may be composed of a plurality of disks 10, so that while one die is under ressure another one is heated and a thirdp one cooled. A press of this kind permits any loss of time to be avoided, as simultaneously one disk-record maybe under pressure while another die intended to receive the pressure is heated and While a third diskrecord which has just been compressed may be separated from its cooled die.

render the pressure uni orm on the whole area of the pressed surface and to control the cooling, which is very useful, as the materials which are hard and elastic at ordinary temperature generally soften but ditticultly when hot and as the cooling under pressure rapidly leads to the limit temperature'at which the plasticity ceases and the elasticity begins.

It has been noticed that with plate-records made of hard and elastic material a sapphire or glass point would be ver convenient for roducin purposes eten i the record has phone.) The points need not be changed after each reproduction and the record wears very little, as the spiral of the record is even polished by the successive passa es of the ords are practically unbreakable. They may be homogepeous if the thickness of the elastic material 1s suiiicient to allow the impressed layer to remain plane without the aid of a layer of any material (cardboard and the like) upon which it is usually mounted.

tion, what I claim, and desire to secure by Letters Patent, is y 1. In a device of the character described the combination with a heat source and press, a rotatable table acting in conjunction therewith, said table being rovided with a plurality of matrix-plate ho ders yieldingly mounted upon a rotatable table and a securing means carried by each of the plates. 2. In a device-of the character described, in combination with a heat source and a press, a rotatable table acting in conjunction thereity of compressible p ate-forms.

3. ln a device of the character'described,

Having nowl fully described my said inven- 4 The compressible plat s 7 are intended to i een ma e by sinuosities, (record of a gramopoint. Besides this, the obtaine disk-rec v ICO with, said table bein provided with a pluralmme the combination Wih :L heat seuree and :L with, plattfforms, and Isprings for securing prees, a rotatable table :loting in conjunction the forms to the table.

Lhercwth und a series of 11atiL-pi1.eholders In testimony whereof l have hereunto Sei.

yieldingly mounted upon a roi-ambie tablemy hand in. presence of two Wi'Lnesses.

arranged within the table. EMILE DESGRANDCHAMPS.

In e device of the character described, 'Vtnssestin combination with a heat source md press, AJJOLPH STURM,

a ommnle table acting in conjunction llere- HANSON COKE. 

